"In the absence of treatment or a vaccine, the SARS-CoV-2 pandemic challenges the medical community to identify novel containment strategies. Changeux et al.1 have proposed the nicotinic hypothesis—that nicotinic acetylcholine receptors may be a therapeutic target to reduce SARS-CoV-2 infection and mitigate COVID-19 disease. Testing the nicotinic hypothesis has implications to prevent and treat COVID-19 disease among billions of patients and health care providers, including those who smoke cigarettes and those who do not."
https://pmc.ncbi.nlm.nih.gov/articles/PMC7239141/